1. Department of Pharmacology and Pharmaceutical Chemistry, University of California, San Francisco, California 94143, National High Field Magnetic Laboratory, 1800 East Paul Dirac Drive, Tallahasee, Florida 32310, Sugen Inc., 351 Galveston Drive, Redwood City, California 94063, Perseptive Biosystems, 871 Dubuque Avenue, South San Francisco, California 94080, Department of Chemistry, Clayton Foundation for Biochemistry, ESB 439, University of Texas, Austin, Texas 78712, and Human BioMolecular Research...